50W Laser Water Pump Adapter (Shenhui 350)

I bought a 50W laser on ebay and they sent a water pump with a ~19mm outlet and a hose with an 8mm inner diameter. My solution was to completely redesign the outlet part for the pump to have a barb on the other end that would fit the hose. This model reuses the o-ring that was on the original part.

You can edit the source model at https://www.tinkercad.com/things/05iwlk797LW-laser-water-pump-adapter

The threads come from NutJob by bob linus http://www.thingiverse.com/thing:193647
The bar